I was thinking the same thing as Belita, did you just get off of BCP? The month that I went off BCP, if I did ovulate (was not temping), it would have been about 4 or 5 days before AF arrived. I typically don't ovulate until after day 20. Keep using OPK's, checking CM and if that doesn't work, in the future you can start temping/charting. GL! I hope you catch the egg this cycle and that your stay is short and sweet!